Please upgrade the witness node before upgrading the stretched cluster or "2+1" cluster environment (skip the following steps if the HCI cluster is non-stretched).

1. Go to the witness node management page and click Upgrade.
2. The witness node will enter cluster upgrade mode during the upgrade, and the cluster environment check will be performed.
3. Upload the witness node update package.
4. Check the update package. (If the current version does not support the active upgrade using the update package, click Next to perform an offline upgrade. If the active upgrade is supported, please wait until all checking steps are finished before the upgrade. If any step fails, fix the issues first.)

Active Upgrade

1. After confirming that the update package is correct, click Next.
2. During the control plane upgrade, you will be logged out. Please wait about 1 minute and then reload the page to log in again.
3. The upgrade is complete.
4. Check that the current version is the latest version.

After the upgrade, please wait for the background of the witness node to take effect before upgrading other nodes in the cluster.

Offline Upgrade

1. After confirming that the update package is correct, click Next.
2. The offline upgrade requires all nodes to be restarted, which will cause business service interruption.
3. Click Next to start the upgrade.
4. The upgrade progress is shown in the figure below.
5. The upgrade is complete.
6. Restart the nodes.

After the offline upgrade of the witness node is complete, and the witness node is restarted, its status will still be displayed as offline. It is because the version of the witness node is inconsistent with other nodes in the cluster. To solve this problem, please upgrade other nodes.